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BUG#15935: post-review fixes: added comment

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sergefp@mysql.com 2006-01-26 00:09:04 +03:00
parent cfce3d823b
commit 5c3027833b
1 changed files with 10 additions and 0 deletions
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10
sql/sql_update.cc
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@ -243,6 +243,16 @@ int mysql_update(THD *thd,
DISK_BUFFER_SIZE, MYF(MY_WME))) DISK_BUFFER_SIZE, MYF(MY_WME)))
goto err; goto err;
/*
When we get here, we have one of the following options:
A. used_index == MAX_KEY
This means we should use full table scan, and start it with
init_read_record call
B. used_index != MAX_KEY
B.1 quick select is used, start the scan with init_read_record
B.2 quick select is not used, this is full index scan (with LIMIT)
Full index scan must be started with init_read_record_idx
*/
if (used_index == MAX_KEY || (select && select->quick)) if (used_index == MAX_KEY || (select && select->quick))
init_read_record(&info,thd,table,select,0,1); init_read_record(&info,thd,table,select,0,1);
else else